Steam and hot-water boiler furnace.



A'. c. EDGAR.

STEAM AND Ho WATER mLER FuRNAcE.

APPLICATION FILED MAR. 8.1917.

Patented Apr. 2, 1918.

2 SHEETS-SHEET l.

A. C. EDGAR.

STEAM AND HOT WATER 'sonia FURNACE.

APPLICATION 4FiLtl) MAR. 8.1917.

Patented Apr. 2, 1918.

2 SHEETS-SHEET 2.

' intricata@ nirwana.

ANDREW C. EDGAR, 0F NElVTOWN SQUARE, PENNSYLVAE'A..

STEAM AND HOT-WATER IBGILER FURNCE.

, Application filed March S, 1917.

` To all whom t may concern: l

Be it known that I, ANDREW C. EDGAR, a citizen of the United States, and a resident of Newtown Square, county of Delaware, State of Pennsylvania, have invented certain Improvements in Steam and Hot-'Water Boiler Furnaces, of which the following is a specification.

My invention relates to boilers used for heating buildings either with hot water or steam.

The invention relates particularly to boilers 'consisting of cast riron sections having portions extending over the lire.

One object of my invention is to construct a boiler furnace ofthis type in such a manner that the products of combustion will be Fig. 4C; and

thoroughly consumed before entering the chimney. The invention can be used either for the burning of soft coal or of hard coal,

-as the case may be.

A further object ofthe invention is to locate a fire brick section above the re in the combustion chamber.

A still further object of the invention is to provide means for supplying air to the upper part of the combustion chamber as fully described hereinafter, reference being had to the accompanying drawings, in which:

Figure 1 is a sectional elevation of a boiler furnace illustrating my invention and taken on the line 1-1, Fig. 2; i Fig. 2 is a sectional view on the line 2 2, Fig. l; 4

Fig. 3 is aperspective'view of one of the fire brick sections Fig. 4 isa view of a modication illustrating a type of boiler having cast iron sections wil I: two depending legs;

Fig. 5 is a sectional view on the line 5-5,

Fig. 6 isa view of a modiiication of the means for admitting heated air 'to the combustion chamber from the ash pit.

l is the base of the furnace. 2 is the grate, of any suitable type. `3, 3, are Athe intermediate cast metal boiler sections. a are the end sections of the boiler. These sections are made hollow, as shown, and communicate' one with another so as to allow the water to circulate freely through all of the sections. Each of the intermediate sections 3 has a depending leg 5 at the rear in which is formed the mud drum 6. The side sections extend down to a point in a line with the legs and form with the intermediate secn Specification of Letters Patent.

Patented Apr. 2, ligt.

serial no. 153,350.

tions the walls of the fire chamber. Eachv lintermediate sections, in the present instance, are tongues 9 which form flue passages of a. greater area than the Hues 7 and 8. These tongues project toward the fire and are hollow 'and communicate" with the legs. They also terminate short of the front plate of the furnace, as shown. The tongues are slightly inclined so as to allow sediment to flow into the back leg and into the mud drum. Formed on the loweredge of each tongue is a double ledge li and formed on. the under portion of the sections t are ledges l2. 13 are blocks of fire brick shaped as clearly shown in Fig. 3, and arranged to lit snugly in the space between the tongues 9 and between the tongues and the end sections.

The ledges il and 12 extend' into grooves in the sides of the fire bricks so that when the ire bricks are in position they extend under the 'tongues and protect them to a certain degree. The fire bricks fit close against the rear wall of the combustion chamber, and terminate short of the front of the boiler furnace, las shown in Fig. l, so as to leave a channel for the passage of the products of vcombustion into the ue i5 die rect-ly above the fire bricks.V

By this construction the re brick sections become het as they are directly above the fire in the combustion chamber and as the gases passup from the bed of fuel on the grate they are not fully consumed but, when they come in contact with the hot fiiebriclr` unconsunied gases, I preferably form coms vtion of the combustion chamber directly becomes heated, passes into the box 19 and from the box through the channel 21 to the combustion chamber so that hot air is added to the unconsumed products of'combustion as they pass in contact with the hot fire bricks and aids materially in the combustion of the said gases. In the front plate of the furnace is the main fire door opening closed by a iiredoor 16. rlhis re door is made hollow, as shown, and the upper portionA projects slightly into the combustion chamber. In the. bottom of the Iire door is a series of openings to admit air and in the upper portion` is a series of openings which communicate -with the combustion chamber sok as to allow the air which becomes heated, as it passes through the door, to enter the combustion chamber and also aid in the combustion of the gases.

17 is a clean out opening closed by a suitable door and 18 is another clean out opening for the flues 7 and 8.

While my invention is particularly adapted for cast iron sectional boilers of the type in which apart of the boiler overhangs the fire chamber, as illustrated in Figs. 1

and 2, the invention can be used in connection with a type of cast iron sectional boiler in which eacl; section has two legs 5f* extending on each side of the fire chamber, as shown in Figs. 4 and 5. In this type of boiler, ribs 14. may be formed on the legs Ato support the fire brick sections 13a and tongues may depend from thecenter of each section to support the fire' bricks in the manner shown in Fig. 2, but, where the fire pct is narrow, these tongues may be dispensed with and a single brick may extend from one side leg to the other.

Where the space between-the surface of the grate and the fire bricks is limited, I may construct the hot air box 19a at the rear of the boiler. sections, as illustrated in Fig. 6, and connect this box with the ash pit through one or more tubes `20u and with the combustion chamber through passages 21EL in the water section.

By making the sections of the boiler in the manner above described, the sections can be added according to the amount of heat desired and the sections ofre brick can also be added, as required. The area of the fines is increased in proportion to the area of the heating surface and the grate surface.- By locating the' ire brick sections lin the space between the depending tongues the fire brick sections can be readily placed in position and can be added as the number of sec tions of the boiler is increased, thus always insuring the proper relation between the grate surface and the fire brick sections, so that ypractically all of the unspent gases arising from the bed of fuel are consumed. In the event of one of the fire brick sections breaking, it can be readily removed through the opening 17 and another fire brickcan be placed in position.

I claim:

1. The combination of a boiler consisting of a series of cast iron sections forming, when assembled, a combustion chamber and "flues, with l'ire brick sections located in the upper portion of the combustion chamber and forming an additional flue so that when the fire brick sections become heated the heat will consume the unconsumed products of combustion escaping from the bed of re.

2. The combination of a sectional boiler having intermediateand end sections, the intermediate sections having depending flanges, the end sections also having iianges forming ledges; and iire brick sections mounted on the flanges and forming the crown of the combustion chamber.

3. The combination in a sectional boiler furnace, of a grate; end boiler sections and intermediate sections extending overthe grate, said sections having depending tongues flanged at the lower edge to form ledges' and fire brick sections mounted on the le ges and forming the crown of the v combustion chamber.

4. The combination in a boiler of the cas't metal sectional type, of al grate; a series of boiler Vsections y consisting of intermediate hollow sections each having a depending leg extending over the grate and side sections,

said side sections and intermediate sections l forming the rear walls of the combustion chamber; lues partly in one section and partly in the other and communicating with the combustion chamber and with the flue leading to the chimney, the intermediate sections having depending tongues; ledges at the lower edges of the tongues; ledges at the inner portions of the side sections; fire brick sections mounted on the ledges, said fire brick sections stopping short of the front of the furnace and forming the crown of the combustion chamber and a flue forming communication between the combustion cham` ber and the main iiues of the boiler.

5. The combination of a sectional cast metal boiler having intermediate and end boiler sections; a grate over which the said sections extend; tongues on the intermedia-te sections, said tongues having ledges; iire brick sections grooved at each edge and restinnr on the ledges and underlappin said ledges and forming the crown of t e fire chamber.

6. The combination. in a boiler furnace of Een the cast metal sectional type, of a base section fornng an ash pit; a grate mounted on the base section; a series of boiler sections extendin over the grate and forming the back Wal of the furnace; a box extending along the back of the furnace and between the grate and the boiler sections; means for conducting air from the ash pit to the box, the boiler sections having passages therein communicating With the box and with the upper portion of the combustion chamber l directlyunder the'iire brick sections.

7. The combination in a boiler furnace of the cast metal sectional type, of intermediate and side sections having depending legs formingthe. back of the combustion charn-` ber; a base on which the sections of the boiler are mounted; a grate; a box located between thel base and the depending legs of the boiler sections at the back of the lire chamber, said box communicating With the ash pit7 each of the intermediate sections of l the boiler having tapered passages in the legs thereof forming communication with the box and the upper portion of the conibustion chamber.

8. A section of a steam boiler furnace having portions extending over the grate and 

